Electricity - 03
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Q.1. If two resistors of 25 ohm and 15 ohm are joined together in series and then placed in parallel with a 40 ohm resistor, the effective resistance of the combination is : *
1 point
Q.2. When an electric lamp is connected to 12 V battery, it draws a current of 0.5 A. The power of the lamp is : *
1 point
Q.3. The unit for expressing electric power is : *
1 point
Q.4. Which of the following is likely to be the correct wattage for an electric iron used in our homes ? *
1 point
Q.5. An electric heater is rated at 2 kW. Electrical energy costs ` 4 per kWh. What is the cost of using the heater for 3 hours ? *
1 point
Q.6. The SI unit of energy is : *
1 point
Q.7. The commercial unit of energy is : *
1 point
Q.8. How much energy does a 100 W electric bulb transfer in 1 minute ? *
1 point
Q.9. An electric kettle for use on a 230 V supply is rated at 3000 W. For safe working, the cable connected to it should be able to carry at least : *
1 point
Q.10. How many joules of electrical energy are transferred per second by a 6 V ; 0.5 A lamp ? *
1 point
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